The invention provides an electrolyte and a preparation method thereof, a lithium ion battery and a preparation method thereof, and a vehicle, the electrolyte comprises fluoroethylene carbonate and a sulfonate additive, the mass fraction of fluoroethylene carbonate in the electrolyte is b%, the mass fraction of the sulfonate additive in the electrolyte is c%, and the sum of the mass fraction of fluoroethylene carbonate and the mass fraction of sulfonate additive in the electrolyte is b%. B and c meet the relational expression: 0.3 < = b/c < = 80. By limiting the mass ratio of the fluoroethylene carbonate to the sulfonate additive, the condition that the cycle performance of the battery is reduced due to the fact that the negative electrode material of the battery is corroded by reactive hydrogen in the sulfonate additive is avoided; and the mass ratio of the fluoroethylene carbonate to the sulfonate additive is limited in a range of 0.3-80, so that the lithium ion battery has good high-temperature performance and good cycle performance at the same time, and the high-temperature cycle performance is excellent.

    本申请提供了一种电解液及其制备方法、锂离子电池及其制备方法和车辆,所述电解液包括氟代碳酸乙烯酯和磺酸酯类添加剂,所述氟代碳酸乙烯酯占所述电解液的质量分数为b%,所述磺酸酯类添加剂占所述电解液的质量分数为c%,所述b和c满足关系式:0.3≤b/c≤80。通过限定氟代碳酸乙烯酯和磺酸酯类添加剂的质量比来避免磺酸酯类添加剂中的活泼氢腐蚀电池的负极材料以致降低电池的循环性能,将氟代碳酸乙烯酯和磺酸酯类添加剂的质量比限定在0.3~80的范围内使得锂离子电池同时具有良好的高温性能和良好的循环性能,高温循环性能优异。


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    Title :

    Electrolyte and preparation method thereof, lithium ion battery and preparation method thereof, and vehicle


    Additional title:

    电解液及其制备方法、锂离子电池及其制备方法和车辆


    Contributors:

    Publication date :

    2024-06-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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